private void buttonAddBuilding_Click(object sender, EventArgs e)
        {
            panelform1.Controls.Clear();
            //lecturerForm lectureform = new lecturerForm();
            Add_WorkingHours_And_WorkingDays.Form2 frm = new Add_WorkingHours_And_WorkingDays.Form2();
            Building build = new Building();

            build.TopLevel = false;
            panelform1.Controls.Add(build);
            build.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            build.Dock            = DockStyle.Fill;
            build.Show();
        }
 private void buttonWorking_Click(object sender, EventArgs e)
 {
     //Add_WorkingHours_And_WorkingDays.Form2 frm = new Add_WorkingHours_And_WorkingDays.Form2();
     //DialogResult selectButton = frm.ShowDialog();
     panelform1.Controls.Clear();
     //lecturerForm lectureform = new lecturerForm();
     Add_WorkingHours_And_WorkingDays.Form2 frm = new Add_WorkingHours_And_WorkingDays.Form2();
     frm.TopLevel = false;
     panelform1.Controls.Add(frm);
     frm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
     frm.Dock            = DockStyle.Fill;
     frm.Show();
 }